python-uci: separate python3 version and bump it to 0.6
This separates python3 version of python-uci package so we can bump it to 0.6 that is not compatible with Python 2.
Implements https://gitlab.labs.nic.cz/turris/turris-os-packages/issues/509
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This separates python3 version of python-uci package so we can bump it to 0.6 that is not compatible with Python 2.
Implements https://gitlab.labs.nic.cz/turris/turris-os-packages/issues/509